Figure 4
The area under the receiver operating characteristic curve (ROCAUC) of serum calcium concentration in the prediction of in-hospital mortality among patients with acute myocardial infarction stratified by quartiles of DTR (A). Compared with other quartiles of DTR, the independent ROCAUC for serum calcium concentration in the highest quartile of DTR was 0.72 (95% CI, 0.69–0.75; P < 0.001). Multivariate combined ROCAUC, which was estimated using a regression model that included age, gender, current smoking, current alcohol use, diabetes mellitus, high-density lipoprotein cholesterol, uric acid, serum phosphate, serum potassium, left ventricular ejection fraction and left atrial diameter, with or without serum calcium among patients in the highest DTR quartile (B). The combined predictive values with and without serum calcium concentration were 0.81 (95% CI, 0.76–0.84; P < 0.001) and 0.76 (95% CI, 0.72–0.79; P < 0.001), respectively. AUC, area under the curve; CI, confidence interval.
